/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.checkpoint.channel;

import org.apache.flink.annotation.Internal;

import java.io.Serializable;
import java.util.Objects;

/**
 * Identifies {@link org.apache.flink.runtime.io.network.partition.ResultSubpartition ResultSubpartition} in a given subtask.
 * Note that {@link org.apache.flink.runtime.jobgraph.IntermediateResultPartitionID IntermediateResultPartitionID}
 * can not be used because it: a) identifies the whole
 * {@link org.apache.flink.runtime.io.network.partition.ResultPartition ResultPartition} b) is generated randomly.
 */
@Internal
public class ResultSubpartitionInfo implements Serializable {
	private static final long serialVersionUID = 1L;

	private final int partitionIdx;
	private final int subPartitionIdx;

	public ResultSubpartitionInfo(int partitionIdx, int subPartitionIdx) {
		this.partitionIdx = partitionIdx;
		this.subPartitionIdx = subPartitionIdx;
	}

	public int getPartitionIdx() {
		return partitionIdx;
	}

	public int getSubPartitionIdx() {
		return subPartitionIdx;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null || getClass() != o.getClass()) {
			return false;
		}
		final ResultSubpartitionInfo that = (ResultSubpartitionInfo) o;
		return partitionIdx == that.partitionIdx && subPartitionIdx == that.subPartitionIdx;
	}

	@Override
	public int hashCode() {
		return Objects.hash(partitionIdx, subPartitionIdx);
	}

	@Override
	public String toString() {
		return "ResultSubpartitionInfo{" + "partitionIdx=" + partitionIdx + ", subPartitionIdx=" + subPartitionIdx + '}';
	}
}
